like just about any other mass produced toy, its hit or miss on how well they work. and, just like any other mass produced toy, just about all of them need some tweaking to get flying their best.
here's a video of how a well piloted picco can fly. its not hard to get it flying that way, just takes some practice and patience. i dont know the guy in the video, but he seems to have the control down pretty good.
http://www.buschflieger.de/content/pics/video23.html
i've noticed the main motor seems to have some drag in it, for some reason. so i have to decide to go with a 4.5ohm 6mm motor, or jump up to a 7mm motor with a larger cell. a 7mm motor in that little heli would make for some interesting flying!
nick